There was a post awhile back about "Frontline For Humans", I don't recall who started it, but I posted then about my sucess with Sawyer's. It is by far the most effective stuff for keeping ticks off. I especially like the fact that you apply it on your clothing rather than on your skin. Plus they claim it will survive 6 washings, I don't know about that, but it seemed to still work for me after 2 washings.